First slide

Magnetic flux and induced emf

Question

A rectangular coil of 20 turns and area of cross- section 25 sq cm has a resistance of 100 ohm. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of 1000 Tesla per second, the current in the coil is

Moderate

A

1.0 ampere
B

50 ampere
C

0.5 ampere
D

5.0 ampere

Solution

$\begin{array}{l} i = \frac{| e |}{R} = \frac{N}{R} \cdot \frac{ΔB}{Δt} Acos θ = \frac{20}{100} \times 1000 \times (25 \times 10^{- 4}) \cos 0^{\circ} \\ \Rightarrow i = 0 .5 A \end{array}$

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